Study On The Stable Isotope Of Human Bones Unearthed From Monkey Cave Site In Huili County,Sichuan Provience

The Monkey Cave Site in Huili County,Sichuan,is an extremely important early cultural center settlement site in the Jinsha River Basin.It has been the focus of academic circles since its excavation.In order to reveal the characteristics of the dietary structure of the ancient ancestors at the site,explore historical information such as production methods,migration of people,and restore the ancient ecological environment characteristics of the site.Using the tracking characteristics of stable isotopes,the stable isotope analysis method is used to analyze the carbon and nitrogen stable isotope analysis,the strontium stable isotope analysis and the carbon and oxygen stable isotope analysis of 76 human bone samples and 42 molar teeth samples unearthed from the Monkey Cave site.Obviously,this will provide evidence for an in-depth understanding of the living conditions,social forms,and ancient environment of the early ancestors in the middle reaches of the Jinsha River Basin,and thus have a positive significance for revealing and enriching the cultural connotation of the Neolithic period in the Jinsha River Basin.The study found:1. Due to the poor preservation of human bone samples,only 11 of the 76 samples can be used for the analysis of carbon and nitrogen stable isotopes.The carbon and nitrogen stable isotopes of 11 human bone samples show that the distribution of?¹³C values is in the range of-10.1‰to-16.3‰(average value is-13.9‰),and the value of?¹⁵N is in the range of 8.7‰to 10.2‰(average value is 9.4‰).2. Using the tail-cutting average method in statistics to determine the local strontium isotope standard range of the site is 0.708766?0.711062,and then use the W test and Q-Q chart test two statistical methods to test.We finally got 2017HXHM101,2017HXHM87,2017HXHM100,In 2017HXHM55,2017HXHM109,2017HXHM56,2017HXHM31,2017HXHM119,2017HXHM116,2017HXHM47,2017HXHM111,a total of 11 individuals are more likely to be migrant population.3.The?¹³C values of the ancestors'enamel of the Monkey Cave site are mainly distributed in the range of-12.0?-3.1‰(average value is-6.4384‰);the?¹⁸O value mainly distributed in the range of-12.4?-9.5‰(average value is-10.7589‰)).Based on the analysis of the isotope ratio test results,this article mainly draws the following points:1?The vegetation types of the ancestors of the Monkey Cave Site in Huili County are mainly C₃ plants and a small amount of C₄ vegetation.The corresponding ecological environment is mainly a closed forest environment and a small part of the grassland environment.2?The diet structure of the ancestors at the Monkey Cave site in the Neolithic period was omnivorous.Most of the ancestors mainly obtained animal protein foods,supplemented by plant foods.Among the plant foods obtained,C₃ and C₄ occupied a proportion.3?The living conditions of the ancestors at the Monkey Cave site in the Neolithic period may be poor,and the level of productivity development is low.It is speculated that the ancestors at the Monkey Cave site lived mainly on agricultural cultivation,as well as hunting and livestock breeding.Its diet and lifestyle are closely related to the natural environment.4?The gender differences and presence or absence of burial items at the Monkey Cave site have nothing to do with the differences in diet structure.The protein intake of minors is slightly higher than that of adults.5?The ancestors of the Monkey Cave site in the Neolithic period existed migration.The migration between the people is related to the fluctuation of the natural environment and the unbalanced pressure between the population and natural resources.